1

我找不到一个确切的问题。

我有一些在标准地图上看起来不错的自定义图钉。如果地图更改为卫星或混合,我想使用其他图钉。

这可能吗?

到目前为止,我已经尝试过:

    annotationImageName = @"blackPin.png";

    if (segment == 1) {
        NSLog(@"segment 1");
        annotationImageName = @"whitePin.png";
    }
    else if (segment == 2) {
        NSLog(@"segment 2");
        annotationImageName = @"greyPin.png";
    }


}

……

MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annotationPin"];

annotationView.image = [UIImage imageNamed:annotationImageName];
4

2 回答 2

1
 - (void) changeMapType: (id)sender
{
     annotationImageName = @"blackPin.png";

        if (mapView.mapType == MKMapTypeStandard)

         {

            mapView.mapType = MKMapTypeSatellite;
            NSLog(@"segment 1");
            annotationImageName = @"whitePin.png";
         } 
         else
          {
            mapView.mapType = MKMapTypeStandard;
            NSLog(@"segment 2");
           annotationImageName = @"greyPin.png";
          }

    } 

MKAnnotationView *annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annotationPin"];

annotationView.image = [UIImage imageNamed:annotationImageName];
于 2016-01-03T18:14:24.213 回答
1

您可以创建自己的注释视图类,该类观察您将mapType在地图视图的属性更改时发布的自定义通知:

@interface MyAnnotationView : MKAnnotationView
@property (nonatomic, strong) id<NSObject> observer;
@end

static NSString *kMapTypeChangeNotificationKey = @"com.domain.app.maptypechange";

@implementation MyAnnotationView

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self.observer];
}

- (instancetype)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier mapType:(MKMapType)mapType {
    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];

    if (self) {
        [self updateImageBasedUponMapType:mapType];

        typeof(self) __weak weakSelf = self;
        self.observer = [[NSNotificationCenter defaultCenter] addObserverForName:kMapTypeChangeNotificationKey object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
            MKMapType mapType = [note.userInfo[@"mapType"] unsignedIntegerValue];
            [weakSelf updateImageBasedUponMapType:mapType];
        }];
    }

    return self;
}

- (void)updateImageBasedUponMapType:(MKMapType)mapType {
    if (mapType == MKMapTypeStandard) {
        self.image = [UIImage imageNamed:@"whitePin.png"];
    } else if (mapType == MKMapTypeSatellite) {
        self.image = [UIImage imageNamed:@"greyPin.png"];
    } else {
        NSLog(@"Unexpected mapType %lu", (unsigned long)mapType);
    }
}

@end

显然,这意味着当您实例化它时,您必须将其传递给映射类型的引用:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) { return nil; }

    static NSString *reuseIdentifier = @"MyCustomAnnotation";

    MyAnnotationView *annotationView = (id)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseIdentifier];
    if (annotationView) {
        annotationView.annotation = annotation;
    } else {
        annotationView = [[MyAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseIdentifier mapType:mapView.mapType];
        annotationView.canShowCallout = true;
    }

    return annotationView;
}

现在,当您更新mapType地图时,还要发布此自定义注释:

- (IBAction)changedValueSegmentControl:(UISegmentedControl *)sender {
    if (sender.selectedSegmentIndex == 0) {
        self.mapView.mapType = MKMapTypeStandard;
    } else if (sender.selectedSegmentIndex == 1) {
        self.mapView.mapType = MKMapTypeSatellite;
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:kMapTypeChangeNotificationKey object:self userInfo:@{@"mapType" : @(self.mapView.mapType)}];
}
于 2016-01-04T06:27:32.160 回答